Reversible watermarking using prediction and Difference Expansion

Reversible data hiding deals with the insertion of auxiliary information into a host data without causing any permanent degradation to the original signal. In this paper a novel reversible data hiding scheme, based on the classical Difference Expansion insertion algorithm, is presented. A prediction stage is adopted in the transform domain and the embedding algorithm is applied to computed prediction errors. To increase the overall embedding capacity, a multi resolution extension has been proposed. Experimental test demonstrate the effectiveness of the proposed approach in achieving high embedding capacity while preserving a high image quality.